This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
This function can be done using Protection relays like Sepam,and can not be done in Micrologic.
Normally, The standby earth fault protection for LV breaker is achieved on the MV side ,so if the LV breaker fails to sense it,the upstream MV protection relay will back up it,and trip the MV breaker.
Normally, The standby earth fault protection for LV breaker is achieved on the MV side ,so if the LV breaker fails to sense it,the upstream MV protection relay will back up it,and trip the MV breaker.